A spokesman said: "Isolated thundery showers are possible today and on Tuesday, and may cause some very localised surface-water flooding of individual properties or roads. Much drier everywhere on Wednesday."

Muggy Netweather said temperatures in the South, with humidity, could feel close to 85F (29C) while the North may enjoy 73F (22C) highs.

Forecaster Jo Farrow said Wales, the North and Northwest could expect further rainfall today, with a dry outlook elsewhere.

She added: "As high pressure begins to build over southern UK there will be moderate south-westerly winds for northern Britain, lighter winds in the South. Into Thursday a warm front approaches from the Atlantic, bringing more cloud.

"With a split in the weather by Friday, northern parts will be cloudy and more prone to outbreaks of rain with a westerly wind, to the south it could remain sunny and very warm again."

Exacta Weather's James Madden said: "It is plausible temperatures could touch or exceed 30C (86F) through this developing period of warm/hot and at times muggy weather."